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Fixing apparatus and heater used in same

Active Publication Date: 2018-10-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent aims to prevent the heater from getting overheated and creating thermal stress. The invention is a fixing apparatus and heater that can handle uncontrolled states without causing damage to the heater.

Problems solved by technology

In fixing apparatuses installed in an image forming apparatus, a fixing apparatus is known that uses a film and that consumes little power and has short warming up time.
However, the temperature of the heater in the area of the heater where the power shut-off member is in contact tends to become lower than the areas where the power shut-off member is not in contact.
As a result, a difference in fixability of the toner image occurs between the area of the heater where the power shut-off member is in contact and the area of the heater where the power shut-off member is not in contact occurs; accordingly, there are cases in which fixing irregularities occur, or a fixing failure occurs in the area where the power shut-off member is in contact.

Method used

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  • Fixing apparatus and heater used in same
  • Fixing apparatus and heater used in same
  • Fixing apparatus and heater used in same

Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

[0021]Hereinafter, configurations and advantages of an image forming apparatus, a fixing apparatus, and a heater according to the present exemplary embodiment will be described.

Image Forming Apparatus

[0022]FIG. 1 is a schematic block diagram of an electrophotographic image forming apparatus according to the present exemplary embodiment.

[0023]A photosensitive drum 1 is a member in which a photosensitive portion is formed on a cylinder-shaped base formed of aluminum or nickel. The photosensitive drum 1 is first rotatably driven in the arrow direction, and a surface thereof is uniformly charged with a charging roller 2 serving as a charging apparatus. Subsequently, a laser scanner 3 performs scanning exposure on the photosensitive drum 1 with a laser beam controlled in accordance with image information, and an electrostatic latent image is formed. The electrostatic latent image is developed and made visible with a developing apparatus 4.

[0024]By applying a voltage to a transfer roller ...

second exemplary embodiment

[0056]The present exemplary embodiment is only different from the first exemplary embodiment in the pattern of the heat generating resistor 14 of the heater 11. Since the other configurations are similar to those of the first exemplary embodiment, description thereof is omitted.

Pattern of Heat Generating Resistor of Present Exemplary Embodiment

[0057]FIG. 6 is a diagram illustrating a shape of a heat generating resistor 24 of a heater 21 according to the present exemplary embodiment, and is a diagram that illustrates a pattern (shape) of the heat generating resistor 24 in the vicinity of an area (a width of 20 mm in the longitudinal direction) of the contact area B of the power shut-off member 18. In the present exemplary embodiment, similar to the first exemplary embodiment, at least a portion of an outline Lin24a of a first portion 24a-1 of a heat generating resistor 24a in area A is provided at a position closer to the power shut-off member 18 than the outline Lin24a of a second p...

first modification example

[0063]In the second exemplary embodiment, slopes with a predetermined angle are formed in the vicinity of the boundary portion of the heat generating resistor; however, in a first modification example of the second exemplary embodiment, the bend portions of the heat generating resistor 24 have a curved shape. Note that other than the configuration of the heat generating resistor at the boundary portion, the configuration of the first modification example is similar to that of the second exemplary embodiment.

[0064]FIG. 8 illustrates the heat generating resistor 24 according to the first modification example. While the angle θ formed in the second exemplary embodiment is 135°, in the present exemplary embodiment, the bend portions of the heat generating resistor 24 are arcs each having a radius of 4.5 mm.

[0065]The first portion and the third portion of the first modification example are also disposed close to the power shut-off member; accordingly, thermal stress acting on the heater ...

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PUM

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Abstract

In a fixing apparatus, a width of a first portion of a first heat generating resistor is narrower than a width of a second portion, at least a portion of an outline of the first portion on the near side with respect to a power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the near side with respect to the power shut-off member, and at least a portion of an outline of the first portion on the far side with respect to the power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the far side with respect to the power shut-off member.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present disclosure relates to a fixing apparatus mounted in an electrophotographic image forming apparatus, such as an LED printer, and to a heater that is used in the fixing apparatus.Description of the Related Art[0002]In fixing apparatuses installed in an image forming apparatus, a fixing apparatus is known that uses a film and that consumes little power and has short warming up time. Such a fixing apparatus includes a heater including a substrate formed of ceramics such as alumina or aluminum nitride, and a heat generating resistor formed on the substrate. The fixing apparatus fixes a toner image to a recording material with heat of the heater through the film.[0003]Incidentally, in preparation for a malfunction of the heater, in the fixing apparatus, a power shut-off member that is actuated by an abnormal temperature rise of the heater and that stops the supply of electric power to the heater is provided in contact with...

Claims

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Application Information

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IPC IPC(8): G03G15/20
CPCG03G15/2053G03G15/2064G03G15/80G03G2215/2048G03G15/2042
Inventor IMAIZUMI, TORUOSADA, HIKARUNAKAJIMA, NOZOMUIKEGAMI, SHOICHIRO
Owner CANON KK
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